I met Tom Lawson founder and president of CogniPower at APEC 2013. CogniPower had a small, inconspicuous booth surrounded by giants with huge booths like Vishay. But this company, although small, has a clever concept called “Predictive energy balancing", a novel technique that Bill Morong and Lawson had developed. The big guys are looking closely at it at APEC.
CogniPower introduced their Predictive Energy Balancing audio amplifier here at APEC 2013. Operating on a completely different principle from other switched-mode amplifiers, this new topology offers the efficiency of the most efficient switched-mode amplifiers with the fidelity of a linear amplifier. They enable better sound for cell phones, tablets and portable media players while extending battery life. These amplifiers can be significantly smaller and less expensive than the amplifiers used now. In addition, the technology is scalable from piezo speakers for cell phones to theater speakers.
You are looking at a version of the amplifier aimed at voice for cell phones. Depending on which screen shot you are looking at, it is either 10 kHz or 15 kHz, with the amplifier clocked at 166kHz. Contact me at firstname.lastname@example.org, and I will send you a screen shot of a 20 kHz sine wave with the same amp being clocked at 1 megahertz.
A very small notch filter removes the carrier frequency quite nicely.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.